Hi Claire,

Without much confidence, I would start by checking matchpats for uses of
fmt.

On 16 April 2012 17:52, Claire Dross <claire.dross@lri.fr> wrote:

> Hello,
>
> I am new to caml-list, so sorry in advance if it is not the right place to
> make this post. In a quite important piece of ocaml code, I have a function:
>
> let matching_term terms env uf id (pats, subst) (seen, forms) =
>    match pats, subst with
>      | _, [] | [], _ -> seen, forms
>      | t :: pats, _ -> fprintf fmt "   %a@." T.print t;
>        let acc = matchpats env terms uf (subst, seen, id+1) t in
>        let acc, seen, _ = List.fold_left (matchpats env env.fils uf)
>          acc pats in
>        seen, List.rev_append acc forms
>
> Removing the print in the second case of the match changes the result of
> the compiled file (compiler 3.12.1) on one of my tests. T.print does not
> have side effects, it recursively prints a hashconsed term structure.
>
> Do you have any idea of what the problem is ?
>
> Thanks a lot,
>
> Claire Dross
>
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